/* helper F: promo badges, live class button, course chat */
.badge-new{background:#1c7c3f;color:#fff}
.badge-promo{background:#b8334a;color:#fff}
.course-card{position:relative}
.course-card .ribbons{display:flex;gap:.3rem;flex-wrap:wrap;margin:0 0 .4rem}
.whatsnew{background:#fff;border:1px solid var(--line);border-radius:12px;padding:1rem 1.2rem;margin:0 0 1.5rem}
.whatsnew h2{margin:0 0 .6rem;font-size:1.15rem}
.whatsnew ul{list-style:none;margin:0;padding:0;display:grid;gap:.5rem;grid-template-columns:repeat(auto-fit,minmax(15rem,1fr))}
.whatsnew li{display:flex;gap:.5rem;align-items:flex-start}
.live-list{list-style:none;margin:0;padding:0}
.live-list li{display:flex;gap:.8rem;justify-content:space-between;align-items:center;flex-wrap:wrap;padding:.7rem 1rem;border-top:1px solid var(--line-2)}
.live-list li:first-child{border-top:0}
.live-list .when{font-size:.88rem;color:var(--muted)}
.btn-live{display:inline-flex;align-items:center;gap:.4rem;border-radius:8px;padding:.45rem .9rem;font-weight:700;border:0;text-decoration:none;cursor:pointer}
.btn-live.off{background:#e3e6ea;color:#7b8794;cursor:not-allowed}
.btn-live.on{background:#1c7c3f;color:#fff}
.btn-live.on .dot{width:.6rem;height:.6rem;border-radius:50%;background:#7CFFA6;box-shadow:0 0 0 0 rgba(124,255,166,.7);animation:livepulse 1.6s infinite}
.btn-live.over{background:#eceef2;color:#5d6b7c;cursor:default}
@keyframes livepulse{70%{box-shadow:0 0 0 .5rem rgba(124,255,166,0)}100%{box-shadow:0 0 0 0 rgba(124,255,166,0)}}
@media (prefers-reduced-motion:reduce){.btn-live.on .dot{animation:none}}
.chat-box{height:20rem;overflow-y:auto;padding:.8rem 1rem;background:#fbfbfd;border-top:1px solid var(--line-2);border-bottom:1px solid var(--line-2)}
.chat-msg{margin:0 0 .7rem;max-width:48rem}
.chat-msg .who{font-size:.8rem;color:var(--muted)}
.chat-msg .who b{color:var(--ink)}
.chat-msg .txt{background:#fff;border:1px solid var(--line-2);border-radius:10px;padding:.4rem .7rem;white-space:pre-wrap;word-break:break-word;display:inline-block}
.chat-msg.mine .txt{background:#e8f0fb;border-color:#cddff5}
.chat-msg .del{background:none;border:0;color:var(--bad);cursor:pointer;font-size:.78rem;padding:0 .3rem}
.chat-form{display:flex;gap:.5rem;padding:.8rem 1rem;align-items:flex-end}
.chat-form textarea{flex:1;min-height:2.6rem;resize:vertical}
.chat-empty{color:var(--muted);text-align:center;padding:2rem 0}
.bell{position:relative;display:inline-flex;align-items:center;color:#fff;text-decoration:none;padding:.3rem .5rem;border-radius:8px}
.bell:hover{background:rgba(255,255,255,.12)}
.bell .count{position:absolute;top:-.15rem;right:-.15rem;background:#d33a4a;color:#fff;border-radius:999px;font-size:.7rem;min-width:1.2rem;padding:0 .3rem;text-align:center;line-height:1.2rem}